[PSUBS-MAILIST] Compensatig fluid and viscosity
via Personal_Submersibles
personal_submersibles at psubs.org
Sat Aug 30 18:46:08 EDT 2014
Brian,
I think the flash point for MMO is only slightly above that for WD-40
which is 122 F. Flash points below 100 F are "flammable" and flash points
from 101 to 200 are "combustible." Proprietary spec sheets will often say
flammable even when in the combustible range. Don't know why; might have
something to do with lawyers.
Veterinary supply stores are the only ones I've found selling unscented
mineral oil in small quantities (1 gallon), and I have no idea of the
viscosity.
I often see a substantial variation in the quoted viscosity of a product.
Again, not sure why. In lubricants the viscosity can double with as
little as a 10 degree F change in temperature. If I were trying to choose
between MMO and a very low viscosity mineral oil, I'd probably test viscosity of
each at 40, 70, and 100 F. Or I'd just ask Alec and go with his
recommendation.
Jim
In a message dated 8/30/2014 3:43:37 P.M. Central Daylight Time,
personal_submersibles at psubs.org writes:
The marvel mystery oil does have a very low viscosity - 2.6 cSt but that
is probably because it has mineral spirits in it, it is flammable and has a
flashpoint of 160 degrees.
here is a link to the penreco mineral oils, I use a cosmetic grade mineral
oil in my beeswax skin cream (Drake oil #7) , I buy a drum at a time so I
guess I'm sort of partial to it. But you can get lower viscosity than
what I use.
http://www.penreco.com/images/spec-sheets/White_Oil.pdf
Brian
--- personal_submersibles at psubs.org wrote:
From: hank pronk via Personal_Submersibles
<personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion
<personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] rpm
Date: Sat, 30 Aug 2014 09:49:41 -0700
Jim, Thanks' I was going to ask what is the preferred oil.
I have been using WD40 for some time now and found no problems. I did
have a clear tube running to a motor and it hardened. Other than that the
motors I have are on their third sub and still working. I will make the
switch to marvel mystery oil since I am now out of WD40.
Hank
--------------------------------------------
On Sat, 8/30/14, via Personal_Submersibles
<personal_submersibles at psubs.org> wrote:
Subject: Re: [PSUBS-MAILIST] rpm
To: personal_submersibles at psubs.org
Received: Saturday, August 30, 2014, 9:22 AM
Hank,
I don't know if you will find an oil with lower
viscosity than WD40.
The problem with WD40 is that it is a solvent that damages
plastic and rubber
components within the motor. Alec Smyth did a lot of
testing on various
oils. The last I knew the medium of choice was Marvel
Mystery Oil.
It's safe for the seals, etc., and has a lower viscosity
than any straight
mineral oil.
For thrusters, comparative amp draw at a given RPM
(with associated heat
build-up) is probably more significant than drop in maximum
RPM since we're
not generally operating at maximum. That might not be true
when you're
using the motor to operate a pump.
Jim
In a message dated 8/30/2014 5:51:09 A.M. Central
Daylight Time,
personal_submersibles at psubs.org writes:
Brian,
Yes, I have heard others have had good success
with
different oils. Maybe the rpm drop is less with other
oils.
Hank
--------------------------------------------
On Fri, 8/29/14,
Brian Cox via Personal_Submersibles
<personal_submersibles at psubs.org>
wrote:
Subject: Re:
[PSUBS-MAILIST] rpm
To: "Personal
Submersibles
General Discussion"
<personal_submersibles at psubs.org>
Received:
Friday, August 29, 2014, 11:26 PM
Hank, There is a very thin
mineral
oil that might be better that the
wd 40
Brian
---
personal_submersibles at psubs.org
wrote:
From: hank pronk via
Personal_Submersibles
<personal_submersibles at psubs.org>
To:
Personal
Submersibles General Discussion
<personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST]
rpm
Date: Fri, 29 Aug 2014 13:23:31
-0700
Vance,
Yes for sure,
Gamma has two separate amp gauges, one for the
motor and one for the rest
of the sub. All 24v and the
trolling motor
is 12 v
Hank
--------------------------------------------
On Fri, 8/29/14, via
Personal_Submersibles
<personal_submersibles at psubs.org>
wrote:
Subject: Re:
[PSUBS-MAILIST] rpm
To:
personal_submersibles at psubs.org
Received: Friday, August 29, 2014, 4:03 PM
Yeah,
too
simple. Maybe that's a good
guess, but..... I will say
that an ammeter in the boat is a good thing. You can
keep
an
eye
on things, and if it goes UP at some stage, you would
suspect a
thruster issue (a tangle, or a bearing failure
or
whatever). All
it takes is an appropriate shunt and a
gauge
(in my pre-digital
steampunk mind). Okay, thanks anyway. I
was curious, that's
all.
Vance
-----Original
Message-----
From: hank pronk via
Personal_Submersibles
<personal_submersibles at psubs.org>
To: Personal
Submersibles General Discussion
<personal_submersibles at psubs.org>
Sent: Fri, Aug
29, 2014 3:56 pm
Subject: Re: [PSUBS-MAILIST]
rpm
Vance,
I did not do an
amp draw test because I do not have the
technology in house. I
would guess with a 10% rpm drop, there
may be a 10% amp
increase. That would be
to simple
:-)
Hank
--------------------------------------------
On Fri,
8/29/14, via Personal_Submersibles
<personal_submersibles at psubs.org>
wrote:
Subject: Re: [PSUBS-MAILIST] rpm
To:
personal_submersibles at psubs.org
Received: Friday, August 29, 2014,
3:39 PM
Hank,
Did you check the amperage? I
wonder if the
resistance causes a
higher draw, and if so,
how
much?
Vance
-----Original
Message-----
From:
hank pronk via
Personal_Submersibles
<personal_submersibles at psubs.org>
To:
personal_submersibles
<personal_submersibles at psubs.org>
Sent: Fri, Aug
29, 2014 3:33 pm
Subject: [PSUBS-MAILIST] rpm
I am working on a
hydraulic
pump that will be
external and pressure compensated
in
oil. I am using a
trolling motor to drive
the pump. A
while back there was
a question about rpm drop when a
trolling motor
is
filled
with oil. I
bench
tested that today,
and the motor runs at 2,000rpm
stock
and
1,800 rpm full of
WD40.
Hank
_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
-----Inline Attachment Follows-----
_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
-----Inline
Attachment Follows-----
_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
_______________________________________________
Personal_Submersibles
mailing
list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
_______________________________________________
Personal_Submersibles
mailing
list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
_______________________________________________
Personal_Submersibles
mailing
list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
-----Inline Attachment Follows-----
_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20140830/4f234400/attachment-0001.html>
More information about the Personal_Submersibles
mailing list